Siemens 580 用户手册

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It is possible for the motor shaft height to change 
relative to the driven equipment and this should be 
compensated for during the alignment procedure.  
Heat from driven equipment can also cause horizontal 
misalignment. 
 

Can cause serious injury. 

Disconnect and lock out power before working on 
equipment. 

 
If motor application is abnormal (high temperature, 
extreme vibration, etc.) consult the factory for special 
instructions or additional information. 
 
Check for vertical alignment (parallelism) of coupled 
drive as follows: 
1.  Operate unit until normal temperature is reached 

(may require several hours). 

2.  Shut down motor and lock out switch. 
3.  Mount dial indicator as in Figure 2. 
4.  Rotate shaft, noting readings at 0°, 90°, 180°, and 

270° (both sides, top, and bottom).  If within 0.002 
inch total indicator reading, or other limit specified 
by the factory, unit is satisfactory for operation. 

5.  If not within limits, add or remove shims as 

required to raise or lower motor. 

6. If shims are changed for high temperature 

operation, repeat alignment procedure to extent 
necessary to assure proper alignment.  Document 
readings for warranty information. 

 

 

Figure 2.  Check of Vertical Alignment 

 
 

 

The standard unfiltered housing vibration limits 
measured at no load, uncoupled, and with rigid 
mounting are as follows based on the requirements of 
NEMA MG1-7.8. 
 

 
After alignment is complete and foot mounting bolts are 
tight, run motor at no load (or minimum possible).  
Check for vibration.  If excessive vibration exists and 
the alignment is acceptable, check foot plane by 
loosening one drive end-mounting bolt at a time as 
detailed below.  This is to be documented for warranty 
information.  When resiliently mounted, allowed levels 
are 25% higher. 

 

Base or foundation rigidity can also affect vibration; 
check for resonance in supporting structure. 

 

Recheck alignment after any change in shims and 
document alignment readings for warranty information. 

 

Completing Mechanical Installation 
After controlling rotor end float and establishing 
accurate alignment, it is recommended to drill and 
ream the foundation plate and motor feet together for 
dowel pins.  (See Doweling).  

Recheck parallel and angular alignment before bolting 
the coupling together.  Motor shaft should be level 
within 0.03 inch after alignment.